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公开(公告)号：US2930923A
公开(公告)日：1960-03-29
申请号：US80861359
申请日：1959-04-24
Applicant: PHILIPS CORP
Inventor： WILHELM LANGMAACK
IPC: H01J19/00
CPC classification number: H01J19/00 , H01J2893/0025
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